Risk assessment for non‐crop hosts of pea enation mosaic virus and the aphid vector <i>Acyrthosiphon pisum</i>

Viral insect-borne plant pathogens have devastating impacts in agroecosystems. Vector-borne are often transmitted by generalist insects that move between non-crop and crop hosts. Insect vectors can wide diet breadths, but it is unknown which hosts serve as pathogen reservoirs host harbours the highest density of vectors. In Pacific Northwest USA, pea aphid (Acyrthosiphon pisum) a key virus vector pulse crops. Despite having large number potential occuring region, no reservoir has yet been identified for economically-costly Pea Enation Mosaic Virus (PEMV). We addressed these issues linking field surveys an with statistical models to develop risk assessments common legumes; 2018, we completed 65-site survey where aphids were surveyed weedy legumes within outside dry fields. quantified abundance on 17 hosts, tissue was tested PEMV. Relatively high densities A. pisum found habitats dominated hairy vetch (Vicia villosa), only legume other than cultivated PEMV detected. Our results indicate V. villosa alternative PEMV, pest management practices this region should consider distribution viral disease mitigation efforts pulses.